Horizontal vessel saddle support weld size calculations 1

[Chandanraj123]

Hi,

I am designing a horizontal pressure vessel and it is supported by 2 off saddles. I am using PVElite design software to design these saddles, but this program doesn't say anywhere or doing any calculations with regards to weld size we need to be using for all the welds on this saddle support. My concern is - this is a very large pressure vessel and has a very high design temperature (575 deg C), to use any weld sizes on this vessel supports without actually doing any calculations.

My question is how do we determine the size of the weld to use on the saddles? is there a calculation provided in any books or code to determine the weld sizes? i have referred the D Moss book procedure 3-10 and 3-11 i couldn't find any info in this book with respect to calculating the weld size.

I would really appreciate if anyone can help me out with a solution to the above problem.

Thank You,
RAJ

 

[Bmechz]

Dear Chandanraj123,

First of all let me know which weld size you want to determine, whether it the weld size between rib to base plate or base plate to deck (without anchor bolt)



Bmechz

 

[racookpe1978]

It seems very odd to me that you are designing a very large, very heavy pressure vessel using a computerized design program "blindly" without being able to even size welds as your own as a check of what the program is telling you?

 

[chicopee]

First you should ask yourself what is the purpose of those welds; when you have answered that question, the you can design the welds for shear, tensile, compressive or bending stresses. As an engineer, you should use a little imagination instead of blindly following other people's work.

 

[coolniks37]

Dear Chandanraj

Pls check "Pressure Vessel design" by Henry Bednar for the saddle support design calculations.